Improvement in valve-gears



2Sheets--Sheet1. F. ,WANNIECK 81. H. KOEPPNER.

Valve-Gear.

Patented June 15, 1875 Invenfira: W124) Mam/J THE GRAPHIC C0.PHDTO LITN.39&4I PARK PLACLNY.

UNITE FRIEDRICH WANNIEGK AND HERMANN KOEIINER, OF BRIINN, AUSTRO HUNGARIAN EMPIRE.

IMPROVEMENT IN VALVE-GEARS.

Specification forming part of Letters Patent No. 164,618, dated J one 15, 1875 application filed March 23,1875.

To all whom it may concern:

Be it known that we, FRIEDRICH WANNIncK .and HERMANN KOEPPNER, both of Briinn,

in the Austro-Hungarian Empire, have jointly invented a new and useful Self-Acting Expansion Link-Motion for Steam-Engines; and we hereby declare that the following is a full, clear, and exact description of the same.

The principle designed to make the degree of feeding a steam-engine dependent on the regulator, as it is brought about, for instance, in Corliss and Sulzers engines, is of eminent importance, but has found only a limited application, because all constructions made hitherto are too complicated and costly.

This invention relates to a peculiar construction which is adapted to remedy the above inconveniences, the new construction being theoretically as correct, but cheaper, less complicated, and more durable than all constructions made hitherto after the said principle.

In the accompanying drawing, Figure Iis a front view, Fig. II a sectional plan, Fig. III a transverse section, and Fig. IV a top view, of our new construction.

Similar letters of reference indicate corresponding parts.

The parts A B O D represent the most important phases of the slide-valve motion. a a are ordinary fiat expansion valves as employed, for instance, in Meyers well-known expansion. (1 is a cross-head, fixed upon the valve-rod I), but movable upon the expansion valve-rods e e, and bearing two latches, g g,

turning on the bolts f f, the under part of the latches being provided with hooks. Hardenedsteel cheeks h h are fixed on the ends of the expansion valve-rods e e and within the crosshead (I. On the opposite ends are pistons, moving air-tight in the cylinders i i, and the back stroke of which may be regulated by the adjusting-screws k k. l l are leathered or otherwise packed pistons, which are fixed on the rods 6 6, but movable in the boxes m m, and closing air-tight toward the valve-chests. The boxes m m communicate with their respective valve-chests, the object being to allow the steam in said chests to exercise pressure against the pistons Z l. a is a rod connected with the regulator, and transmitting,

by means of levers and rods, the up-and-down motion of the regulator to the butt-pins 0 0.

It is obvious that if the two slide-valves a and c, which are represented in their middle position, are supposed in their lowest position A, the steam-port in the distributing slidevalve to is quite opened, and the latch 9 falls down behind the steel cheeks h, and is hooked thereon. Then a forward motion of the slidevalve to to the right hand takes place the slidevalve 0 is forced to participate in the motion of the slide-valve a, without changing its positioii with respect to the latter until the latch g butts against the pin 0, and is disengaged with its hooks from the steel check It, and consequently thrown out of gear. At this moment the steam-pressure transmitted from the valve-chest to the piston l will cause the expansion-slide valve 0 to spring back, and consequently shut off the steam-port in the slidevalve a. The said disengaging and shutting off will take place sooner or later, according as the pin 0 is in a lower or higher position, respectively, to the latch g, and the said position being dependent on the regulator, the degree of feeding or expansion is also dependent on the situation of the regulator. Any steam-engine provided with such a linkmotion will therefore measure automatically the quantity of steam required for working. When the expansion slide-valve chas been thrown back, the distributing slide-valve a, advances under the slide valve 0 until the end of its travel, and then returns to the beginning of its travel. The steam-port in the slide-valve (0 becomes again free from the expansion slide valve, the latch 9 falls with its hooks behind the-steel cheek h, and the working begins again.

It is understood that the above dispositions concern both sides of the cylinder. It will be understood that we do not limit ourselves to the precise details indicated in the drawing, as these details are capable of being modified without departing from the essential characteristics of this invention; as, for instance, a mechanism, Fig. X or Fig. Z, may be employed instead of the steam-tight pistons movable in the chests m m.

The above-described new and peculiar disposition of self-acting expansion link-motion is designed to obtain in the most simple and cheapest way, and without springs, weights, or other similar contrivances, all the advantages offered by Corliss and Sulzers more complicated link-motions.

lVe claim the protection of the law on the following points:

1. The combination of the movable buttpins or stops 0 0, the main valve-rod crosshead d, and latches g g, with the expansion- Valves 0, pistons Z, and boxes m, in direct communication with the steam-chest, said parts being constructed and arranged for joint operation, as shown and described.

2. In combination with the expansion-valve, and piston connected therewith, and operated on by steam-pressure to return said Valve to its normal position, the means herein shown and described, whereby the back stroke of said expansion-valve and piston is regulated.

FRIEDRICH WANNIEOK. HERMANN KOEPPNER. Witnesses:

WILLIAM HiJ'NIG, JOSEPH ADLER. 

